136 
are often furcate ; but the most remarkable character is 
the oblong- pointed appendage to each valve upon the 
space beneath the beaks extending the whole length of 
the shorter side; the teeth are not very numerous. 
The only specimens I know of this curious shell are 
in the collection of Miss Dent, who found them at 
Barton^ and has kindly allowed me to figure them. 
